Any desire to add a subwoofer to your stereo hi-fi system will naturally stem from your desire to hear more bass, deeper bass, or both. There are crucial factors to consider to implement a subwoofer correctly based on your system equipment and room, and common mistakes to be wary of. This setting ensures the movement of the speaker’s bass drive and sub’s woofer is ‘in phase’ with one another (when one kicks forward, so does the other). It’s arguably easier to use dedicated subwoofer test tones, but they’re more accessible from an AV amplifier than a stereo one. Additionally, using multiple subs pressurises the room they’re in more evenly, providing a more balanced bass performance.